It sounds like you have a power supply problem! You will probably find some bad caps (capacitors) on the board. They will look bulged on the top an may be a little leaky (brownish stain). As far as the noise problem this could be caused by harmonics, from the bad caps!

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The problem is likely with the screen itself. The power supply usually supplies both screen and speakers and has a light flashing on it indicating that it has power. Screens are often not worth replacing unless under warranty as they can sometimes cost as much as new TV to replace.

I would actually not recommend opening the TV since you could get an
electrical shock. I can suggest you to unplug the TV for a while (30 minutes)
and then just plug it back in and turn it on. If that does not work, my
recommendation for you is to take the TV to a local repair shop. It may be a
fuse or internal component shorted out, but in this case is better to have a technician check the
unit.

Symptoms of a Defective or dying Power supplies on LCD TVs.
1. Light(s) on the front panel are behaving not normal example, blinking, amber color or
not steady, fainting, etc.
2. TV not turning ON properly.
3. TV turns OFF by itself.
4. Needs to be unplug to many times to make it work.
5. Humming or high pitch noise heard through speakers or at the back of the TV.
I repair these power supplies. Write to jah2mil@hotmail.com if you require further assistance.

Symptoms of a Defective or dying Power supplies on LCD TVs.1. Light(s) on the front panel are behaving not normal example, blinking, amber color or not steady, fainting, etc.2. TV not turning ON properly.3. TV turns OFF by itself.4. Needs to be unplug to many times to make it work.5. Humming or high pitch noise heard through speakers or at the back of the TV.

Symptoms of a Defective or dying Power supplies on LCD TVs.1. Light(s) on the front panel are behaving not normal example, blinking, amber color or not steady, fainting, etc.2. TV not turning ON properly.3. TV turns OFF by itself.4. Needs to be unplug to many times to make it work.5. Humming or high pitch noise heard through speakers or at the back of the TV.

Symptoms of a Defective or dying Power supplies on LCD TVs.1. Light(s) on the front panel are behaving not normal example, blinking, amber color or not steady, fainting, etc.2. TV not turning ON properly.3. TV turns OFF by itself.4. Needs to be unplug to many times to make it work.5. Humming or high pitch noise heard through speakers or at the back of the TV.